Dynamo-electric machine.



Patented Jan. 30, |900.

E. W. G. C. HOFFMANN. nYNAMu ELEcTmc MACHINE.'

Patented lan. 30, i900.;

E. W. G. G. HOFFMANN. DYNAMO .ELECTRIC MACHINE.

(Application filed July 21, 1899.) (No Model.) 2 Sheets-*Sheet 2.

n 6fm.. W.. .MJ

UNITED STATES PATENT OFFICE.

ERNST VILIIELM GUSTAV CARL HOFFMANN, OF CHARLOTTENBURG,

GERMANY, ASSIGNOR TO THE SIEMENS da IIALSKE ELECTRIC COM- PANY OF AMERICA, OF CHICAGO, ILLINOIS.

nYNAMo-ELECTRIC MACHINE.

SPECIFICATION forming part of Letters Patent No. 642,123, dated January 30, 1900.

Application 'filed July 21,1899. Serial No. '724.,633.y (No model.)

To all 1071/0711/ it may concern:

Be it known that I, ERNST VILHELM GUS- 'rAv CARL HOFFMANN, a subject of the Emperor of Germany, residing at Charlottenburg, Germany, have invented a certain new and useful Improvement in Dynamo-Electric Machines, (Case No. 199,) of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to dynamoelectric machines, and is of particular utility in connection with alternating-current d ynamo-electric machines, and especially those of a multiphase type.

The invention has for its object the provision of improved means whereby the stators orstationary members of dynamo-electric machines and parts associated therewith 'that are normally out of reach may be reached and :repaired in the event of injury as well as means for securing the adjustment of the said stationary and rotating members.

Itis important in dynamo-electric machines to be able to adjust the revolving and the stationary members for the purpose of making their centers identical. If the distance between the parts varies in different places, there will be an unequal distribution of the magnetism, which, aside from disadvantages resulting with respect to electrical matters, will produce a disturbance of equilibrium of the magnetic power, and there will follow a one-sided strain on the axis. These troubles increase in proportion to narrowing of the air-space between the revolving and the stationary part. One must, on the one hand, be careful to build both parts, particularly the outer one, suficiently strong in order to prevent any material change of shape after boring it out on the inside. On the other hand, appliances must be provided which will facilitate the work of centering both parts. Such centering has to be done not only upon rst erecting the machine, but may become necessary after a long run-for instance,when the bearings have become Worn or when changes have taken place in the relative position of the bearin gs of the frame. Furthermore, in large machines whose lower portions generally extend down into a pit in order that the shaft may have lower bearings it is of importance to have all parts, both the revolving and the stationary ones, readily accessible. For this purpose it is advantageous to arrange the external stationary part so that it can be turned, and thus every part of it may be brought into position suitable for examination and for necessary repairs.

Generally speaking, the invention consists in providing a support for the station ary memberV which serves to permit the stationary member to be turned about the axis of the rotatable member when required. Fastening devices are provided normally to maintain the stationary member in its adjusted position which it is normally to occupy, which fastening devices are disengaged from the said member when it is to be rotated. The supporting parts for the stationary member are provided with adjusting mechanism whereby said member is in a limited degree movably mounted with respect to the rotating member.

In accordance with the preferred embodiment of the invention a peripheral flange is provided about the stationary member, the magnetic portion of the stationary member being secured to the three flanges. The invention is primarily adapted for use in connection with heavy machines, and the flanges should be of sufficient size 'to maintain their form. The anges are preferably normally supported at the lower portions thereof upon rollers or other suitable supports which will permit the stationary member to be turned when released from its fastening devices.

I will explain the invention more particularly by reference to the accompanying drawings, illustrating the preferred embodiment thereof, in which- Figure 1 is a front elevation of a dynamoelectric machine equipped with the devices of my invention. Fig. 2 is a side elevation of the apparatus shown in Fig. 1. Fig. 3 is a sectional view on line 3 3 of Fig. 1. Fig. Liis an end view of a roller-bearing for the stationary member of the dynamo. Fig. 5 is a longitudinal elevation thereof. Fig. 6 is a cross-sectional view online 6 6 of Fig. 5. Fig. 7 is an axial sectional view of the support for the rollers, the rollers being shown in complete elevation.

Like letters indicate like parts throughout the different figures.

The dynamo-electric machine shown is of well-known form ,comprising a rotatable member c and a stationary member b, the latter inclosing the former and mounted within a casing or peripheral Iiange c. Radial iianges d d are secured to the peripheral flange c and thereby to the stationary member. The rotatable member is mounted upon a shaft supported in bearings at its ends. The desired accurate adjustment of the air-gap between the rotatable and stationary members may be effected by the adjusting devices e c of wellknown form, these adjusting devices being so constructed that the stationary member of the dynamo maybe moved in a plane perpendicular to the axis of rotation in any direction to secure the required adjustment of the air-gap. The adj usting devices e e are secured to the perpendicular faces of the flanges d d.

In practicing my invention with the particular type of machine shown I provide bearings fj" in the pit g, into which pit the dynamo is partially inserted. These bearings preferably normally coact with the devices c e in supporting the stationary member in place. The bearings ff are preferably of the construction shown most clearly in Figs. 4, 5, 6, and 7,eaoh bearin g comprising two rollers h h, mounted upon a common shaft, which is supported at its ends in bearings. Each roller h is provided with a ange t' for the purpose of preventing longitudinal displacement of the stationary member when the same is to be turned and for the furtherpurpose of maintaining the stationary member in its true plane. The tread portions of the rollers engage corresponding peripheral tread portions of the flanges d d. When it is desired to turn the stator portion of the dynamo, the supporting devices e c are removed, whereupon the said stator portion may be turned to the desired extent to permit of access to the parts normally to be contained within the pit. After the inspection has been had the member b may readily be restored to its normal position, whereupon the devices e c may be replaced. lThese, as shown in Fig. l, have guideflan ges on their sides and are adjusted to move slightly in or out in the direction of the axis and afterward may be screwed tightly to the supporting-flanges. By normally maintaining the supports in engagement with the flanges d d the adjustment of the air-gap between the members of the dynamo previously effected need not be disturbed upon the removal of the supporting and adjusting devices e c.

In practice I preferably iirst secure the adjustment of the air-gap by means of the devices e e, after which the rollers h h are engaged with the flanges d d. In order to adjust the rollers 7L h to have proper engagement with the flanges, I provide wedge-shaped blocks 7c 7c, which by means of the bolts ZZ may be thrust in either direction to elevate or lower the shafts supporting the rollers. After the rollers have properly been brought into engagement with the flanges the adjustment effected by the bolts His maintained by the nuts m m.

While I have herein shown and particularly described one form of supports upon which the stationary member of the dynamo may be turned, I do not wish to be limited to the precise means shown', but,

Having thus described my invention, I claim as new and desire to secure by Letters Patentl. The combination, in a dynamo-electric machine, with the stationary member thereof, of a roller-mounting for said stationary member permitting the same to be rotated, and means for normally preventing the stationary member from being rotated, substantially as described.

2. The combination, in a dynamo-electric machine, with the stationary member thereof, of rollers h h disposed in position to support the same and permit its retation, and devices e c adapted normally to hold said stationary member against rotation, substantially as described.

3. The combination, in a dynamo-electric machine, with a stationary member, of a rotatable member, means for supporting and permitting the rotation of the normally stationary mem ber and adjusting mechanism permitting the relative adjustment of the stationary and rotatable members, whereby the air-gap is regulated, substantially as described.

4. The combination, in a dynamo-electric machine, with the stationary member thereof, of a roller-mounting for said stationary member permitting the same to be rotated, and means for securing the adjustment of the position of the stationary member, substantially as described.

5. The combination, in a dynamo-electric machine, with the stationary member thereof, of rollers h h disposed in position to support the same and permit its rotation, and an adjustment for the rollers, comprising coacting portions having inclined faces and actuating screws, substantially as described.

The combination, in a dynamo-electric machine, with the stationary member thereof, of rollers h 7i disposed in position to support the same and permit its rotation, devices c e adapted normally to hold said stationary IOC IIC

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member against rotation, and an adjustment for the rollers, comprising coacting portions having inclined faces and actuating-screws, substantially as described.

7. The combination with the stationary member of a dynamo-electric machine, of a rotatable member inclosed thereby, and rolling-bearing devices f f located beneath the stationary member and serving normally to support the same and upon which the stationary member is adapted to be turned, substantially as described.

8. The combination with the stationary member of a dynamo-electric machine, of a rotatable member inclosed thereby, and adj ustable rollin g-bearing de vices f f located beneath the stationary member and'serving normally to support the same and upon which the stationary memberis adapted to be turned, substantially as described.

9. The combination with the stationary member of a dynamo-electric machine, of a rotatable member in'closed thereby, rollingbearing devices ff located beneath the stationary member and serving normally to support the same and upon which the stationary member is adapted to be turned, and adjusting devices e e for effecting the adjustment of the air-gap between the stationary member and the rotating member and cooperating with the said rolling-bearing devices to support the stationary member, substantially as described.

10. The combination with the stationary member of a dynamoelectric machine, of flanges d d secured thereto, adjusting devices c e for adjusting the air-gap between the stationary and rotating members, and rollingbearing devices f f located beneath the stationary member and engaging the said flanges, substantially as described.

11. The combination with the stationary member of a dynamo-electric machine, of flanges CZ d and a peripheral flange c interposed between the anges d o7, and secured to the stationary member, adjusting devices ce for adjusting the air-gap between the stationary and rotating members, and rolling-bearing devices ff located beneath the stationary member and engaging the said flanges, suby,

stantially as described.

In witness whereof Ihereunto subscribe my name this 30th day of June, A'. D. 1899.

ERNST WILHELM GUSTAV CARL HOFFMANN. Witnesses:

' HENRY HASPER,

WOLDEMAR HAUPT. 

